Ziparchive: Enable -Wconversion
Enable -Wconversion (but not -Wsign-conversion). Fix up code. Handle
some actual error cases:
* too many files
* files too large
Bug: 130039052
Test: atest ziparchive-tests
Change-Id: I632af317b9e65dbc728851efefd0d11a2b5c29b9
diff --git a/libziparchive/zip_writer.cc b/libziparchive/zip_writer.cc
index 0df0fa5..ae9d145 100644
--- a/libziparchive/zip_writer.cc
+++ b/libziparchive/zip_writer.cc
@@ -169,8 +169,8 @@
year = 80;
}
- *out_date = (year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday;
- *out_time = ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1;
+ *out_date = static_cast<uint16_t>((year - 80) << 9 | (ptm->tm_mon + 1) << 5 | ptm->tm_mday);
+ *out_time = static_cast<uint16_t>(ptm->tm_hour << 11 | ptm->tm_min << 5 | ptm->tm_sec >> 1);
}
static void CopyFromFileEntry(const ZipWriter::FileEntry& src, bool use_data_descriptor,
@@ -193,7 +193,8 @@
dst->compression_method = src.compression_method;
dst->last_mod_time = src.last_mod_time;
dst->last_mod_date = src.last_mod_date;
- dst->file_name_length = src.path.size();
+ DCHECK_LE(src.path.size(), std::numeric_limits<uint16_t>::max());
+ dst->file_name_length = static_cast<uint16_t>(src.path.size());
dst->extra_field_length = src.padding_length;
}
@@ -203,6 +204,11 @@
return kInvalidState;
}
+ // Can only have 16535 entries because of zip records.
+ if (files_.size() == std::numeric_limits<uint16_t>::max()) {
+ return HandleError(kIoError);
+ }
+
if (flags & kAlign32) {
return kInvalidAlign32Flag;
}
@@ -210,10 +216,17 @@
if (powerof2(alignment) == 0) {
return kInvalidAlignment;
}
+ if (alignment > std::numeric_limits<uint16_t>::max()) {
+ return kInvalidAlignment;
+ }
FileEntry file_entry = {};
file_entry.local_file_header_offset = current_offset_;
file_entry.path = path;
+ // No support for larger than 4GB files.
+ if (file_entry.local_file_header_offset > std::numeric_limits<uint32_t>::max()) {
+ return HandleError(kIoError);
+ }
if (!IsValidEntryName(reinterpret_cast<const uint8_t*>(file_entry.path.data()),
file_entry.path.size())) {
@@ -237,7 +250,7 @@
std::vector<char> zero_padding;
if (alignment != 0 && (offset & (alignment - 1))) {
// Pad the extra field so the data will be aligned.
- uint16_t padding = alignment - (offset % alignment);
+ uint16_t padding = static_cast<uint16_t>(alignment - (offset % alignment));
file_entry.padding_length = padding;
offset += padding;
zero_padding.resize(padding, 0);
@@ -314,7 +327,8 @@
}
z_stream_->next_out = buffer_.data();
- z_stream_->avail_out = buffer_.size();
+ DCHECK_EQ(buffer_.size(), kBufSize);
+ z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
return kNoError;
}
@@ -322,25 +336,31 @@
if (state_ != State::kWritingEntry) {
return HandleError(kInvalidState);
}
+ // Need to be able to mark down data correctly.
+ if (len + static_cast<uint64_t>(current_file_entry_.uncompressed_size) >
+ std::numeric_limits<uint32_t>::max()) {
+ return HandleError(kIoError);
+ }
+ uint32_t len32 = static_cast<uint32_t>(len);
int32_t result = kNoError;
if (current_file_entry_.compression_method & kCompressDeflated) {
- result = CompressBytes(¤t_file_entry_, data, len);
+ result = CompressBytes(¤t_file_entry_, data, len32);
} else {
- result = StoreBytes(¤t_file_entry_, data, len);
+ result = StoreBytes(¤t_file_entry_, data, len32);
}
if (result != kNoError) {
return result;
}
- current_file_entry_.crc32 =
- crc32(current_file_entry_.crc32, reinterpret_cast<const Bytef*>(data), len);
- current_file_entry_.uncompressed_size += len;
+ current_file_entry_.crc32 = static_cast<uint32_t>(
+ crc32(current_file_entry_.crc32, reinterpret_cast<const Bytef*>(data), len32));
+ current_file_entry_.uncompressed_size += len32;
return kNoError;
}
-int32_t ZipWriter::StoreBytes(FileEntry* file, const void* data, size_t len) {
+int32_t ZipWriter::StoreBytes(FileEntry* file, const void* data, uint32_t len) {
CHECK(state_ == State::kWritingEntry);
if (fwrite(data, 1, len, file_) != len) {
@@ -351,7 +371,7 @@
return kNoError;
}
-int32_t ZipWriter::CompressBytes(FileEntry* file, const void* data, size_t len) {
+int32_t ZipWriter::CompressBytes(FileEntry* file, const void* data, uint32_t len) {
CHECK(state_ == State::kWritingEntry);
CHECK(z_stream_);
CHECK(z_stream_->next_out != nullptr);
@@ -379,7 +399,8 @@
// Reset the output buffer for the next input.
z_stream_->next_out = buffer_.data();
- z_stream_->avail_out = buffer_.size();
+ DCHECK_EQ(buffer_.size(), kBufSize);
+ z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
}
}
return kNoError;
@@ -404,7 +425,8 @@
current_offset_ += write_bytes;
z_stream_->next_out = buffer_.data();
- z_stream_->avail_out = buffer_.size();
+ DCHECK_EQ(buffer_.size(), kBufSize);
+ z_stream_->avail_out = static_cast<uint32_t>(buffer_.size());
}
if (zerr != Z_STREAM_END) {
return HandleError(kZlibError);
@@ -491,7 +513,11 @@
cdr.crc32 = file.crc32;
cdr.compressed_size = file.compressed_size;
cdr.uncompressed_size = file.uncompressed_size;
- cdr.file_name_length = file.path.size();
+ // Checked in IsValidEntryName.
+ DCHECK_LE(file.path.size(), std::numeric_limits<uint16_t>::max());
+ cdr.file_name_length = static_cast<uint16_t>(file.path.size());
+ // Checked in StartAlignedEntryWithTime.
+ DCHECK_LE(file.local_file_header_offset, std::numeric_limits<uint32_t>::max());
cdr.local_file_header_offset = static_cast<uint32_t>(file.local_file_header_offset);
if (fwrite(&cdr, sizeof(cdr), 1, file_) != 1) {
return HandleError(kIoError);
@@ -508,10 +534,15 @@
er.eocd_signature = EocdRecord::kSignature;
er.disk_num = 0;
er.cd_start_disk = 0;
- er.num_records_on_disk = files_.size();
- er.num_records = files_.size();
- er.cd_size = current_offset_ - startOfCdr;
- er.cd_start_offset = startOfCdr;
+ // Checked when adding entries.
+ DCHECK_LE(files_.size(), std::numeric_limits<uint16_t>::max());
+ er.num_records_on_disk = static_cast<uint16_t>(files_.size());
+ er.num_records = static_cast<uint16_t>(files_.size());
+ if (current_offset_ > std::numeric_limits<uint32_t>::max()) {
+ return HandleError(kIoError);
+ }
+ er.cd_size = static_cast<uint32_t>(current_offset_ - startOfCdr);
+ er.cd_start_offset = static_cast<uint32_t>(startOfCdr);
if (fwrite(&er, sizeof(er), 1, file_) != 1) {
return HandleError(kIoError);